1640712770 has 16 divisors (see below), whose sum is σ = 2954847168. Its totient is φ = 655937520.

The previous prime is 1640712767. The next prime is 1640712779. The reversal of 1640712770 is 772170461.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640712770.

It is not an unprimeable number, because it can be changed into a prime (1640712779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23174 + ... + 61793.

It is an arithmetic number, because the mean of its divisors is an integer number (184677948).

Almost surely, 2^1640712770 is an apocalyptic number.

1640712770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640712770 is a deficient number, since it is larger than the sum of its proper divisors (1314134398).

1640712770 is a wasteful number, since it uses less digits than its factorization.

1640712770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86905.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 1640712770 is about 40505.7128069609. The cubic root of 1640712770 is about 1179.4445269327. Note that the first 3 decimals are identical.

The spelling of 1640712770 in words is "one billion, six hundred forty million, seven hundred twelve thousand, seven hundred seventy".